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1、JointInternationalTopicalMeetingonMathematics&ComputationandSupercomputinginNuclearApplications(M&C+SNA2007)Monterey,California,April15-19,2007,onCD-ROM,AmericanNuclearSociety,LaGrangePark,IL(2007)COUPLEDBWRCALCULATIONSwiththeNUMERICALNUCLEARREACTORSOFTWARESYSTEM∗∗∗T.
2、Sofu,J.W.Thomas,D.P.Weber,andW.D.PointerArgonneNationalLaboratory9700S.CassAve,Argonne,Illinoistsofu@anl.gov;jthomas@anl.gov;dpweber@anl.gov;dpointer@anl.govT.J.DownarDepartmentofNuclearEngineeringPurdueUniversity400CentralDriveWestLafayette,IN47907downar@ecn.purdue.e
3、duABSTRACTTheNumericalNuclearReactor(NNR)isasoftwaresuiteforintegratedhigh-fidelityreactorcoresimulationsincludingneutronicandthermal-hydraulicfeedback.Usingsolutionmoduleswithformulationstoreflectthemulti-dimensionalnatureofthesystem,NNRoffersacomprehensivecoremodeli
4、ngcapabilitywithpin-by-pinrepresentationoffuelassembliesandcoolantchannels.Originallydevelopedforpressurizedwaterreactors,theNNRanalysiscapabilitieshaverecentlybeenextendedforboilingwaterreactor(BWR)applicationsaspartofEPRIFuelReliabilityProgram.Theneutronicsmethodolo
5、gyisextendedtotreatnon-periodicstructureofBWRfuelassemblies,andanewEuleriantwo-phaseCFDboilingheattransfermodelhasbeenintegratedwiththesoftwaresystem.Thispapersummarizestheexperiencewith,andresultsof,thefirst-of-a-kindcoupledcalculationsasdemonstrationofafully-integra
6、ted,high-fidelitysimulationcapabilityforassessmentofmargintocrud-inducedfailurefromfuel-dutyperspective.KeyWords:BWRsimulation,coupledcalculations,EulerianboilingmodelforCFD.1.INTRODUCTIONThesoftwaresystemknownasNumericalNuclearReactor(NNR)providesthefirstexampleofnex
7、t-generationsimulationtoolsfordesignandanalysisofalight-waterreactor(LWR)corebasedonhigh-fidelity,first-principlesbasedcalculations.[1,2,3]NNRiscapableofperformingintegratedneutronicandthermal-hydraulicanalysisforareactorcoreatanunprecedentedscaleandtheleveloffidelity
8、.WithNNR,awhole-coreLWRsimulationwithpin-by-pinrepresentationofthefuelassembliesisfeasibleusingsub-pinlevelthermalfeedbackan
